PHYSICS 7D Lecture Notes - Lecture 20: Electromotive Force, Electric Field, Voltage
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Document Summary
Lecture 20: electromagnetic introduction: motional electromotive force. A conducting rod moving in a uniform. F b =qv x b, if v b, f b =qvb. + charge build up at a and - charge build up at b. Potential difference across the ends of a rod moving perpendicular to a magnetic field is v ab =el=vbl. In general form, a conducting rod moving in a uniform b will generate an emf so long as the rod has a component of v b. For an infinitesimal rod length dl d = (vxb) Equivalent to faraday"s law = - when the loop through which the flux is changing is a conductor and the change in flux is due to part of the conducting loop moving, like in the slide-wire generator. With changing b field we have induced emf and current in the circle (faraday"s law) This looks like an electric field in the wire tangent to the circle.
